Evaluation of extraction methods for arsenic speciation in polluted soil and rotten ore by HPLC-HG-AFS analysis |
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Authors: | Chun-Gang Yuan Bin He Er-Le Gao Jian-Xia Lü Gui-Bin Jiang |
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Affiliation: | (1) State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, 100085 Beijing, P.R. China;(2) School of Environmental Science and Engineering, North China Electric Power University, 071003 Baoding, Hebei, P.R. China |
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Abstract: | Three extraction systems including shaking, ultrasonic and microwave-assisted extraction were evaluated. Water and phosphate buffer were tested for the extraction of arsenic compounds in polluted soil, describing the water-soluble or plant-available fraction. The stabilities and recoveries of various arsenic species indicated that no obvious changes of species occurred during the extraction process. The raw extracts were cleaned up by C18 cartridge before analysis. Having optimized the extraction conditions, the arsenic species in polluted soil and ore from the different pollution sources were extracted by microwave-assisted extraction with 0.5 M phosphate buffer as extractant. Arsenic species were quantitatively determined by high performance liquid chromatography on-line coupled with hydride generation atomic fluorescence spectrometry (HPLC-HG-AFS). As(III) and As(V) were the major arsenic species in the polluted soil samples resulting from irrigation by waste water. AsV was the only form found in the rotten ore sampled in mining area. During the extraction process, the recoveries of spiked As(III), As(V), DMA(V) and MMA(V) were 85.4 ± 7.2%, 80.2 ± 6.7%, 101.6 ± 6.7% and 98.8 ± 9.1%, respectively, showing that most water-soluble arsenic could be measured. |
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Keywords: | : Arsenic speciation microwave-assisted extraction soil and ore. |
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